Before taking this medicine viagra expiration Alprostadil can also be injected directly into the penis. A very small needle about the size of those used to inject insulin is used for this purpose, so any pain or discomfort should be minimal. Penile injections can be used alone or in combination with an oral drug.Very common (10% or more): Pain in extremityUncommon (0.1% to 1%): Hematuria

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Drug interactions viagra sildenafil increased redness of the eyeIf you take Viagra after a high-fat meal, the medicine may take a little longer to start working.Tadalafil has been used in approximately 15,000 men participating in clinical trials, and over eight million men worldwide (primarily in the post-approval/post-marketing setting). The most common side effects when using tadalafil are headache, stomach discomfort or pain, indigestion, burping, acid reflux, back pain, muscle aches, flushing, and stuffy or runny nose. These side effects reflect the ability of PDE5 inhibition to cause vasodilation (cause blood vessels to widen), and usually go away after a few hours. Back pain and muscle aches can occur 12 to 24 hours after taking the drug, and the symptom usually disappears after 48 hours.Tell your doctor about all the medicines you take including prescription and non-prescription medicines, vitamins, and herbal supplements. Levitra and other medicines may affect each other. Always check with your doctor before starting or stopping any medicines. Especially tell your doctor if you take any of the following: